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Added another example of valid format for date string in `date` field…

… types
See commit `7f4e703cb02a309221981943da912803be2ef24e` which introduced the
freeform "January 6, 1972 16:05:00" format.
The "1972/1/6 16:05:00" format is presumably more compatible
with various platforms and easier to return from `strftime()`.